JPS583628B2 - The sun is shining on the ground. - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a video signal in which characters, symbols, etc. that explain the image are added to an image such as a picture, graph, or figure projected on the screen of a picture tube. In particular, the present invention relates to a device for easily obtaining a video signal in which characters, symbols, etc. are inserted accurately at desired positions in an image.

Hereinafter, an example of the apparatus of the present invention will be explained with reference to the drawings.

In the figure, reference numeral 1 denotes a video signal source such as a video tape recorder, an image pickup tube, a television receiver, etc. An input video signal from this source is supplied via an amplifier 2 to a picture tube 3, on which a still image PA is projected.

Then, the light from this picture tube 3 is focused by a projection lens 4, reflected by a half mirror 5, and the reflected light is made to enter a focusing glass 6, so that the image PA projected on the picture tube 3 is and get the same image.

Then, a translucent sheet 7 is placed on the surface of the focusing glass 6 opposite to the surface on which the light from the picture tube 3 enters.
On this sheet 7, characters, symbols, etc. for explanation of the displayed image PA, for example, are drawn by hand using black ink or the like at desired positions while viewing the image PA.

In the example shown in the figure, the characters and symbol "Mt. Fuji 8th station ■" are drawn diagonally on the upper left of sheet 7 (
(See PB in the figure).

In this way, the image PB with characters, symbols, etc. added to the image PA is captured by the image pickup tube 8 through the half mirror 5 on the side on which the image PA is projected.

In this case, the horizontal deflection of the image pickup tube is reversed.

Then, the video signal obtained from the image pickup tube 8 is extracted as is as an output video signal, or signal components corresponding to information such as hand-drawn characters and symbols are extracted from the video signal from the image pickup tube 8. This is combined with the input video signal from the amplifier 2 and extracted.

Therefore, switches 9 and 10 are provided that operate in conjunction with each other, and when these switches 9 and 10 are respectively switched to the contact a side, the video signal with characters, symbols, etc. taken out from the image pickup tube 8 is transferred to these switches. switch 9 and 10
The signal is supplied to the picture tube 11 via the picture tube 11 and displayed, and the signal is taken out from the output end 15.

When the switches 9 and 10 are respectively switched to the contact b side, the video signal from the image pickup tube 8 is supplied to the clipper 12 via the switch 9, thereby producing a black level signal, that is, black ink on the sheet 7. Characters drawn by etc.
A signal corresponding to information such as a symbol is extracted, and this extracted signal is supplied to the synthesizer 14 through one contact d side of the switch 13. On the other hand, the input video signal from the amplifier 2 is supplied to the synthesizer 14, and this A signal obtained by combining both signals is supplied to the picture tube 11 via the switch 10 and taken out from the output end 15.

In this way, the image PC projected on the picture tube 11 has its characters, symbols, etc. appearing in black.

In this case, the switch 13 is switched to the contact e side, the black level signal from the clipper 12 is supplied to the phase inversion circuit 16 via this switch 13, a white level signal is obtained from this, and this is sent to the synthesizer. 14, the picture tube 11
In the image displayed on the PC, characters, symbols, etc. can be displayed in white.

In addition, when information such as characters and symbols is not added to the input video signal, that is, to the image projected on the picture tube 3, the switches 9 and 10 are switched to the contact C side, and the input video signal from the amplifier 2 is directly transmitted to the picture tube 3. 11 for display and output to the output terminal 15.

As described above, according to the apparatus of the present invention, a video signal in which characters, symbols, etc. are added to an image at a desired position can be obtained.

Therefore, if the device of the present invention is used in an educational video projector, etc., while looking at an image and giving a verbal explanation, it is possible to write characters, symbols, etc. for explanation at any desired position on the image, and it is possible to insert Since it is possible to obtain images that have been modified, the educational effect is significantly improved.

In addition, when the input video signal is a black and white signal, the sheet 7
By applying color to the input black and white video signal and capturing the image using a color image pickup tube, it is possible to obtain a color video signal in which a desired color is applied to the input monochrome video signal.

Furthermore, in the present invention, since characters, symbols, etc. can be drawn on the side opposite to the side to be imaged by the image pickup tube, pens, hands, etc. are not imaged by the image pickup tube, and therefore the screen It doesn't look unsightly at all.

Note that when the input video signal is a color video signal and the image pickup tube 8 captures a color image with color text inserted, in order to extract the color text from this image, the color image from the image pickup tube 8 must be A signal obtained by inverting the input color video signal may be combined with the video signal.

[Brief explanation of the drawing]

The figure is a system diagram showing an example of the apparatus of the present invention, in which 1 is an input video signal source, 3 and 11 are picture tubes, 7 is a translucent sheet, 8 is a picture tube, and 15 is a system in which characters, symbols, colors, etc. are added. This is the output terminal for the video signal in the current state.

Claims (1)

[Scope of Claims] 1. A picture tube that projects an input video signal, and a translucent sheet on which the screen of the picture tube is projected on one side and information such as characters and symbols can be drawn on the other side. Then, from one side of this sheet, there is an image pickup tube that images the screen of the picture tube projected onto this sheet and information such as characters and symbols drawn on the sheet, and from this image pickup tube. A device that obtains a video signal with information such as characters and symbols added to the image from which the output video signal is extracted. 2. A picture tube that projects an input video signal, a translucent sheet on which the screen of this picture tube is projected on one side, and information such as letters and symbols can be drawn on the other side, and the above-mentioned parts of this sheet. It consists of an image pickup tube that simultaneously captures the screen of the picture tube projected onto the sheet and information such as characters and symbols drawn on the sheet from one side, and the output signals of the image tube are used to capture the characters, symbols, and other information drawn on the sheet. An image in which information such as characters and symbols is added to an image in which a signal corresponding to information such as symbols is extracted, and this is combined with the input video signal to obtain an output video signal. A device for obtaining signals.